start_charge · Smartcar MCP Server MCP: Risk & Policy

WHAT IT DOES

What start_charge does on Smartcar MCP Server

AI agents invoke start_charge to trigger actions in Smartcar MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why start_charge needs a policy

This tool sends a command to a physical electric vehicle to begin charging. It triggers an external operation with real-world effects (activating charging hardware, potentially drawing power, interacting with charging infrastructure).

From the tool's definition 'Start charging an electric vehicle' — triggers an external physical operation on a real-world vehicle (initiates charging session)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

start_charge Rate-limited

start_charge stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "start_charge": {
      "limits": [
        {
          "counter": "start_charge_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Smartcar MCP Server, so you can run agents against it safely.

FAQ

Questions about start_charge

What does the start_charge tool do? +

Start charging an electric vehicle. It is categorised as a Execute tool in the Smartcar MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on start_charge? +

Register the Smartcar MCP Server MCP server in PolicyLayer and add a rule for start_charge: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Smartcar MCP Server. Nothing to install.

What risk level is start_charge? +

start_charge is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit start_charge? +

Yes. Add a rate_limit block to the start_charge rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block start_charge completely? +

Set action: deny in the PolicyLayer policy for start_charge. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides start_charge? +

start_charge is provided by the Smartcar MCP Server MCP server (thachdosc/smartcar-mcp-test). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.